Suction cleaner



y w. p. SELLERS 2,080,510

' J-- v SUGRI'ON" CLEANER Filed NOV. 28, I L934 4 Sheets-Sheet 1 INVENTOR William D.Jeller.s- 0 SM ATTORNEY y 1937. w. D. SELLERS, 2,080,510

SUCTION CLEANER Filed Nov. 28, 19:54 4 Sheets-Sheet 2 l ll li i'illll/ l/1 a V n/ III INVENTOR ATTORNEY May 18, 1937.

SUCTION CLEANER Filed Nov. 28; 1934 4 Sheets-Sheet :s I

-INVENTOR M z'lliam D.JelIem ATTORNEY w. D. SELLERS 2,080,510 i May 18,1937. w. D SELLERS 2,080,510

SUCTION CLEANER Filed Nov. 28, 1934 4 Sheets$heet 4 INVENTOR PVl'lll'am D. J'e/lers ATTO RN EY Patented May 18, 1937 UNITED STATES sncrron CLEANER.

William D. Sellers, Glen Ellyn, Ill., asslgnor to The Hoover Company, North Canton, Ohio, a

corporation of Ohio Application November 28, 1934, Serial No. 755,093

21 Claims.

The present invention relates to suction cleaners in general, and particularly to automatic means for adjusting a rotary agitator brush for the purpose of increasing its efiective life.

It is an object of the invention to provide a new and improved suction cleaner construction. It is another object of the invention to provide new and improved agitator-mounting and adjusting means in a suction cleaner. A further object is the provision in a suction cleaner or similar machine, of an agitating element including brush bristles, in combination with means which automatically re-position theelement relative to the cleaner body and to the surface covering undergoing cleaning for the purpose of increasing the effective life of the element by compensating for wear. A still further object is the provision in a suction cleaner, of a rotary brush including radially extending bristles, the length of which decrease with use, in combination with mounting means which lower the brush relative to the cleaner body as the length of the bristles decreases due to wear. Still another object is the provision in a suction cleaner in the nozzle of which is a rotary agitating brush, of means to gauge automatically the efiective diameter of the brush, and means to re-position the brush automatically relative to the plane of the nozzle mouth. A still further object is the provision'of automatic means to re-position a rotary agitator relative to-its supporting body, including centrifugally operated means. These and other more specific objects will appear upon reading the following specification and claims and upon considering in connection therewith the attached drawings to which they relate.

- Referring now to the drawingsin which preferred embodiments of the present invention are disclosed:

Figure 1 is a side elevation of a suction cleaner, certain parts being broken away to illustrate the present invention embodied therein;

Figure 2 is a partial vertical section through the cleaner nozzle upon the line 22 of Figure -1;

Figure 3 is a fragmentary cross section through the cleaner nozzle, similar to the showing of Figure 1, but with the agitator rotating and with the agitator-positioning mechanism positioned accordingly Figure 4 is a partial section through the nozzle and brush upon the line 4-4 of Figure 3 and shows the position of the centrifugally operated means in the rotating brush position;

Figure 5 is a transverse vertical cross section through the cleaner nozzle, with certain parts broken away;

Figure 6 is a section upon the line 6-45 of Figure 5 with a new brush rotating in the cleaner nozzle;

Figure 7 is a fragmentary bottom plan view showing the enclosing shroud for that part of the agitator-supporting mechanism which extends into the nozzle wheel pocket;

Figure 8 is a vertical section upon the line 8-8 of Figure 6 through the ratchet cam and its manyually operated positioning means;

Figure 9 is a section similar to Figure 6 illustrating the operating position of the brush-adjusting mechanism with a worn brush, indicated by dotted lines, positioned inthe nozzle;

Figure 10 is a vertical section upon the line Ill-l0 of Figure 5 showing the agitator-supporting and positioning mechanism at the opposite side of the nozzle;

Figure 11 is a fragmentary section similar to Figure 9 illustrating the position of the agitatoradjusting mechanism after the worn brush, illustrated in Figure 9, has been removed;

Figure 12 is a fragmentary showing of a nozzle, similar to that included in Figure 1, illustrating a second preferred embodiment of the invention with the brush standing still;

' Figure 13 is a view similar to Figure 12 illustrating the position of the parts with the new brush, indicated by the dotted line, rotating;

Figure 14 is a section through the nozzle and agitator upon the line 14- ofFigure 12, showing the position of the centrifugally operated means in the standing brush relationship;

Figure 15 is a view similar to Figure 14 being also a section upon the line Iii-l5 of Figure 13, illustrating the position of the parts during the rotation of the brush;

Figure 16 illustratesthe relative positions of the parts with a worn brush in the inoperative relationship;

Figure 17 is a section similar to Figure 16 showtrifugally-actuated mechanism with .the brush tating means which usuallycomprise a rotating brush. In use the brush bristles wear away and the effective diameter of the brush is decreased. If the brush is to maintain itscontact with the surface covering it must be adjusted relative to its supporting body, usually the nozzle of the cleaner, and so relative to theplane of the surface covering undergoing cleaning. If this adjustment is not made the force of the contact of the brush with the surface covering is decreased to such. a point thatno effective agitation takes place, or the surface covering entirely fails to contact the brush and it is completely inoperative. This adjustment may be accomplished manually or it may be made unnecessary by the substitution of a new brush each timethe effective diameter of the agitator brush is materially decreased. According to the present invention means have-been provided which automatically lower the rotary agitating brush relative to the cleaner body, and more particularly relative to the cleaner nozzle mouth, to bring the worn agitator brush to the same position relative to the surface covering undergoing cleaning that it had when new. The means by which this automatic adported-"upon spaced front'wheels I2, I2 and upon justment is accomplished are hereinafter fully described Referring again to the drawinss,.and to Figures 1' to 11 inclusive in which the first preferred embodiment of the invention is disclosed, amodern suction cleaner is illustrated. The cleaner comprises a; nozzle I having front and rear surface-contacting lips 2 and 3 which define the plane of its mouth. The nozzle is interiorly connected by an air passageway 4 to the fan chamber 5 in which is positioned a rotatable fan 6. Chamber 5 is provided with an exhaust outlet 1 to which a suitable dust bag 8 is removably secured. Immediately above the fan chamber 5 is positioned a motor casing 9 which: houses a suitable driving motor for the suction-creating fan 6. The motor proper "is not shown, but its driving shaft III is seento extend through the fan chamber 5, where it carries the fan 6, and into the air passageway 4 where its lower end is provided with a pulley II. The-cleaner body is movably sup.-

rear wheels I3, I 3 there being only one rear wheel shown in the drawings. The front wheels I2, l2 are positioned within wheel pockets I4 which are formed at the rear corners of the nozzle I by the side walls of the air passageway 4.v This rela-l tionship is illustrated clearly in Figure 7. As in the usual cleaner construction a handle I! is'provided through which the operator may exert the necessary propelling force for the machine, the handle being bifurcated at its lower end and pivotally connected to the casing at the sides of the fan chamber 5.

A rotary brush is positioned within the nozzle 1 and includes a longitudinally extending body I6, at the ends or which are provided bearings- I I, I! the outer races of which function as agi tator'supports, and bristles I8. In its operative position the brush should be so positioned rela tive to the nozzle I that its bristles I8, I8, which are spirally arranged around the body It, extend substantially into the plane of the surface-contacting nozzle mouth defined by the nozzle lipsv 2 and 3. In Figures 1 and 3 a new brush is illustrated and is seen to be so positioned. In Figures 9 and 10 a brush which issubstantially worn out is illustrated in dotted lines and is also seen to be so positioned. At substantially the longitudinal center of the body I6 a pulley I9 is formed and between this pulley and the pulley I I formed 'uponthe lower end of the motor shaft III there extends a power-transmitting belt 20, as in the agitator is carried by this frame through having the outer races of its bearingsill, I'l enclosed by downwardly opening spring seats 24, 24 positioned on the side arms 2 I, 2 I. This seating-relationship is such that upon the physical exertion of a sufficient force the agitator may be downwardly displaced from the supporting frame, and from the seats 24., 24, to be removed through-the nozzle mouth as defined by the lips 2 and 2. Within ing between the wheel pocket and the nozzle proper so that unnecessary leakage of air i m the pocket into the nozzle proper is prevented.

The agitator carrying frame is pivoted to permit movement of the brush up and down within the nomle but it is normally retained in the uppermost position permitted by a ratchet cam 26, which contacts one of the side arms 2I .on its cam face, by a coil spring 21. Spring 21, which seatsupon the pivot pin 22 of-the arm 2I., resiliently urges the arm upwardly into contact with the ratchet cam, as illustrated, for example, in Figuresl and 3., Cam 2i is so shaped that its rotation in a counter-clockwise direction, as

viewed in Figures 1 and 3, forces the agitator downwardly. Cam 26 is rotatably mounted upon the side wall of the nozzle and isprovided with an outwardlyor axially extending pin 22 which extends through an arcuate slot 20-in the side wall of thenozzle and permits of the manual ad- Justment of the cam under certain conditions. The arcuate slot 2! is closed by a plate 20 carried y by the pin. This coil springperforms a double pin 28 and spring-pressed against the, inner side of the nomle wall by a coil spring 2i carried function in that it serves to hold plate III in slotsealing relationship and also exerts sumcient the brush, by a coil spring 35 carried by the pivot pin 34. At the ratchet cam end of the nozzle the arm 33 extends rearwardly of its pivot pin, as shown in Figure 9, and is provided at its end with a pivoted pawl 36 the lower toothed end of which is adapted to engage selectively the teeth of the ratchet cam 26. A coil spring 31 Contact of shoe 32 with thesurface of the agitator brush in the operation of the machine I of the agitator body l6, and within an enclosing and during rotation of the brush is \obviously undesirable as an unnecessary load a would be placed on the driving motor. To prevent this contact centrifugally controlled means are provided which lift the shoe-carrying arms 33, 33 during brush rotation, at the same time lowering the pawl 36, and in the event the pawl is in engagement with a tooth of the ratchet cam that member may also be moved. This centrifugally operated means comprises a weight 40 which is pivotally carried by an L-shaped lever 4l'on the surface housing 42. The inner end of lever..4| extends into the agitator l6, which is bored atits end,

and seats in a sliding plunger 43 which is urged by a coil spring 44 at its inner end in the direction of the end of the agitator. The end of the plunger is reduced in diameter and in its outer position extends from the end of the body I 6, the side member 2| of the agitator-supporting frame being curved upwardly at that point to avoid the plunger. A pivoted lever 45, provided with a cam face adjacent the end of the plunger 43, is carried by the forward end of arm 2| upon a pin 46. Forward of the pin 46 lever 45 contacts the underside of a shoulder formed upon the shoe-carrying arm 33. A coil spring 41 carried by the pivot pin 46 normally urges the forward end of the lever 45 upwardly into contact with the arm 33 and is of suflicient force to lift upwardly that arm and the shoe 32, and so the arm 33 at the opposite side of the nozzle, until the shoe is out of contact with the brush. To make this relationship possible the force exerted by the spring 21, which urges the agitator-carrying frame upwardly, must be of sufficient strength to prevent the downward movement of the frame under the force exerted by spring 41. Inaddition the relationship between the forces exerted, and

the lever arms present, must be such that the arm 33 can pivot upwardly under the force exerted by spring 41 against the opposing force exerted by coil spring 35 which normally urges the arm 33 downwardly.

The operation of this embodiment of the invention is easily understood. With'a new brush, I positioned within the nozzle and carried by the" parts with the brush not rotating is as indicated in Figures 1 and2 of the drawings. .The brushdiameter-gauging shoe 32 contacts the periphery of the brush alongits top front side. The ratchet cam 26 is in its new brush position and the pawl 36 lies adjacent the first tooth of the series of teeth on the ratchet. The spring-pressed plunger has been urged outwardly by its coil spring 44 into contact with the cam face of pivot lever 45 and has pivoted the rear end of that lever upwardly resulting in the lowering of the forward end thereof, against the spring force exerted by coil spring 41, thereby permitting the shoe 32 to be moved into contact with the brush periphery by the action of coil springs 35, 35 acting upon lever arms 33, 33.

Upon the closing of the operating switch of the cleaner and the rotation of the cleaner motor, the fan, the driving pulley II and the agitator are rotated. Upon attaining a suflicient speed theweight 40 carried by the brush is thrown outwardly by centrifugal forcefrom the position' shown in Figure 2 to that shown in Figure 4. This action causes the pivotal movement of lever 4| and plunger 43 is forced inwardly into the agitator body against the force exerted by its coil spring 44. This movement withdraws the end of plunger 43 from contact with the cam face of lever 45 and permits the coil spring 41 acting upon that lever to raise the forward end thereof upwardly to lift the shoe-carrying arms 33, 33 and the shoe 32 from its contact with the rotating agitator.

At the end of the cleaner operation, and upon the agitator coming to a stop, weight 46 again assumes the position shown in Figure 2 and plunger 43 is again forced outwardly by its spring resulting in the raising of the cam end of pivoted arm 45 thereby permitting the lowering of shoe 32 under the action of coil spring 35. If

the operation has been of suflicient duration to produce appreciable brush wear the forward end of arms 33, 33 will pivot to a lower position than they formerly assumed in the inoperative relationship, their position being determined by the position of the shoe 32 when in contact with the surface of the brush. Obviously the lesser the diameter of the brush the lower willbe the position of shoe 32 and the greater will be the pivotal movement of the arms 33, 33. As the forward end of arm 33 at the ratchet end of the nozzle is lowered the rearward end thereof is raised,.and if the movement of the arm, as gauged by the shoe 32, is suflicient the pawl 36 slips over and engages the first tooth of the series of teeth on ratchet 26. In the disclosures of Figure 9 the brush diameter has been decreased to such a point that the brush is practically worn out and the pawl has moved tothe final tooth on the ratchet cam. In normal usage this would never be accomplished in one In such operation and the radial movement of the weight 40 under centrifugal force the forward end of each arm 33 is again forced upwardly under the action of spring 41 and the rearward end of the pawl carrying arm is forced downwardly. This movement of arm 33 forces pawl 36 downwardly-and ratchet cam 26 is rotated to the extent of that movement which is just suflicient tolower the brush .so that its lower end extends in the same position relative to the plane of the nozzle mouth as it extended before any wear took place. The relationship between the teeth of the ratchet cam 25 and of the pawl 36 is also such that the pawl 33' will only engage a new tooth of the ratchet cam-.when the agitator-diameter-gauging mechanism detects a definite and predetermined decrease in the brush diameter.

After the agitator brush has been. reduced in diameter beyond a certain point it is desirable' i I includes the unseating of the bearings I 1, I! from is beyond the radius of the teeth and further their seats 24, 24 in the agitator-supporting side the parts after this operation has been completed. Under the operation of the downwardly torcingspring 35 the shoe-carrying arms 33, 33

have been pivoted to their lowermost position and the rear end of the pawl-carrying arm 33 contactsthe upper wall of the nozzle. The pawlpivoting, spring 3'! is unable to move the pawl into contact with the teeth of the ratchet cam -26 in this .position as the toothed end of the pawl pivotal movement of the pawl is prevented by the stop 39. Before the new brush is positioned the operator manually rotates the ratchet cam 25 in a clockwise direction, as viewed in'Figure 11,

through a force exerted upon the pin 28 which extends through the nozzle side wall as clearly evidenced in Figure 8. The ratchet cam is moved from its position illustrated in Figure 9 to the new brush position illustrated in Figure 1.

.Thereafter the new brush can be inserted and the relationship of the parts will again be that Y illustrated in Figure 1.

[Referring now to Figures 12 to 17, inclusive, a

, second preferred embodiment of the invention is disclosed. Except as hereinafter stated this embodiment is similar to that first described and the same parts have the same reference characters. In' the first described embodiment the brush-contacting-diameter-gauging shoe 32 was normally held out of engagement with the rotating'j brush by means of the spring-urged pivoted arm .or. lever 45 which was carried by the agitatorsupporting arm 2|. According to the present embodiment that lever arm 45 with its spring .41 has been eliminated and in its place is provided a lever arm 50 which is pivoted upon the pivot pin 22 of the agitator-supporting arm 2| but is free for; independent movement relative thereto. 50' is provided at; its forward end with a pin' 5i which extends across the nozzle between arms 33, 33, being slidable in a substantially horizontal slot 52 in each, and also supports one end of the shoe 32. Pivoted lever 551s also provided with a-cam face adjacent the endof plunger 43 which, in the present embodiment is urged inwardly into the agitator body I5 "by its coil spring 44. A weight 40 is again carried by the pivoted L-shaped arm or lever 4| within thehousing 42 and in this embodiment contacts plunger 43 \to urge it outwardly in the rotation of thebmsh.

m the operation or this embodiment the rotation'of the brush results in the outward radial ,movement of the centrifugally operated weight Figure 11 illustrates the position of 40 and the plunger 43 is moved longitudinally and outwardly from the agitator body against the force exerted by the coil spring 44. The end of the plunger contacts the cam face of lever 50 resulting in the raising of that member. As lever 50 is connected through pin 5| at its upper end to the shoe-supporting arms 33', 33, those arms are also moved upwardly and the shoe 32 is lifted from contact with the brush. Upon the cessation of agitator rotation the plunger is forced inwardly under the force exerted by its spring 44 and the brush-contacting shoe 32 is moved into contact with the brush periphery under the action of the arm-pivoting springs 35, 35. The adjustment of the ratchet cam by the pawl 36 is accomplished in this embodiment as the shoe is lifted from the brush in the exact manner of the first embodiment.

Referring now to Figures 18 to 22, inclusive, a .third preferred embodiment of the present invention is disclosed. According to this embodiment of the invention the agitator is again supwhich is itself provided with a coil-spring 54 which urges it in a clockwise direction as viewed in Figures 18 and 19. Its movement in this direction is prevented only by the engagement of the pawl 53 with the teeth. To raise the brushcontacting shoe 32 from the agitator in its rotation the centrifugally-actuated weight 40 is again provided which forces the plunger 43 outwardly against the force of its coil spring 44 and into contact with the cammed outer end of the lever arm 55 which is mounted on the side arm 2| similarly to the lever arm 45 of the first embodiment. In the case of lever arm 55, however, no coil spring urges the forward end of the arm upwardly to move the shoe 32-from contact with the brush. Instead the movement of the plunger 43 against the cam surface of the arm results in the downward movement of the rear end of the arm and the upward movement of the forward end of the arm to lift the brush. In the rotation of the brush with the plunger extended outwardly under the action of the centrifugally operated weight the rearward end of arm will be lowered, as stated, andthe brush-contacting shoe 32 will be raised from contact with the brush. x

In this embodiment the lowering of the agitator-carrying frame upon brush wear is again accomplished by the rotation of the ratchet cam 23. At the end of each cleaning operation as the weight 40 becomes ineffective and the plunger 43 is moved inwardly under the force of its spring 44 theshoe 32 is lowered into contactwith the brush by the action of spring 35,- the arm MW tively, and the ratchet cam is seen to be moved in a counter-clockwise direction to as far as possible. This adjustment is again accomplished by the manually-operable pin'23 which extends through the outer wall of the nozzle casing. In the new brush position the toothed pawl 53 contacts the first tooth of the ratchet cam. As the shoe 32 is lowered into contact with the brush as the brush ceases to rotate the pawl 53 is raised and if the movement of the arm 33, as determined by the shoe, is suflicient a tooth of the ratchet slides under the pawl and the ratchet cam rotates in a clockwise direction under the force exerted by its coil spring 54, the'agitatorcarrying arm 2| being forced downwardly. The pawl 53 contacts the following tooth of the ratchet cam, however, and further movement is prevented. This relationship continues until all of the teeth have passed under the pawl 53 and the parts have assumed the relationship shown in Figure 22. It is then time to replace the rotary brush and after this has been accomplished the ratchet cam is manually moved counter-clockwise by the pin 28 to the position shown in Figure l8 and the machine is again ready for automatic adjustment during the complete life of the brush. As distinguished from the first two embodiments the adjustment of the height of the agitator-carrying frame takes place at the end of each cleaning operation instead of at the beginning.

I claim:

1. In a suction cleaner, abody, a rotary brush, means mounting said brush on said body for movement toward and from a surface covering undergoing cleaning, and automatic means to effect a lowering of said brush including centrifugally operated means, adjustable means to lower said brush in certain adjustments by a force exerted by said centrifugally operated means, and means responsive to change in the diameter of said brush controlling the adjustment of said adjustable means.

2. In a suction cleaner, a nozzle, a rotary brush in said nozzle, a pivoted arm adjustably supporting said brush in said nozzle, means to force said arm downwardly to lower said brush including a ratchet cam operatively connected to said arm and a pawl cooperating with said cam, a second pivoted arm supporting said pawl, a shoe adapted to contact said brush in certain positions of said second" arm and carried thereby, resilient means acting on said second arm to urge said shoe into contact with said brush, and centrifugally operated means responsive to the rotation of the brush for raising the shoe therefrom.

3. In a suction cleaner, a body, a rotary agitator brush, means movably mounting said brush,

spring means urging said brush upwardly, a cam contacting said mounting means and movable to force said means downwardly against the force exerted by said spring means, means responsive to change in the diameter of said brush, cooperating means between said responsive means and said cam relatively positioned by said responsive means, said cooperating means being adapted to exert a moving force on said cam, and centrifugally operated means rotatable with said brush to move said responsive means from said brush I and to actuate said cooperating means.

4; In a suction cleaner, a body, a rotary agitator brush, means movably mounting said brush, spring means urging said brush upwardly, a cam contacting said mounting means and movable to force said means downwardly against the force exerted by said spring means, means responsive to changes in diameter of said brush, cooperating means between said responsive means and said cam relatively positioned by said a pawl adapted to engage successively the teeth of said ratchet cam, means to control the adjustment of said pawl relative to said cam comprising brush-diameter change-responsive means, and centrifugally operated means rotatable with said brush to exert a force on said pawl to move said cam.

6. In a suction cleaner, a body, a rotating brush, means supporting said brush for vertical movement relative to said body, means to lower said supporting means comprising a ratchet cam, means to actuate said cam including a pawl adapted to engage successively the teeth of said ratchet cam, means to control the ad-- justment of said pawl relative to said cam comprising brush-diameter change-responsive means, and centrifugally operated means rotatable with said brush to render said responsive means inoperative during the rotation of said brush.

7. In a suction cleaner, a body, a. rotatable brush, means adjustably supporting said brush on said body, means adapted to transmit a force to move said brush relative to said body, brushdiameter-change-iresponsive means controlling said last mentioned means, and 'centrifugally operated means actuated by said brush to render said responsive means inoperative during the rotation of said brush.

8. The construction recited in claim 7 characterized in that said centrifugally operated means are carried by said brush.

9. The construction recited in claim '7 char acterized in that said centrifugally operated means are connected to said force-transmitting means and are adapted to deliver force thereto.

10. In a suction cleaner, a body, a rotatable brush, means movably mounting said brush on said body, means to adjust said brush relative to said body and to a surface covering undergoing cleaning including means to move said mounting means, a brush-diameter-change-responsive means controlling said last mentioned means, and means responsive to rotational forces to hold said responsive means inoperative during cleaner rotation.

11. In a suction cleaner, a body, a rotatable brush, means adjustably mounting said brush on said body, means to adjust said brush relative to saidbody and to a surface covering undergoing cleaning including a spring-urged ratchet cam to move said mounting means, a pawl determining the position of said ratchet cam, brushdiameter-change-responsive means controlling said pawl, and means to render said responsive means inoperative during the rotation of said brush;

12. In a suction cleaner, a body, a rotatable brush, a frame mounting said brush for vertical movement relative tosaid body, spring means urging said frame upwardly, means determining the upper position of said frame, brush-diameter-responsive means determining the position of said last mentioned means, and means responsive to centrifugal forces determining the position of said responsive means.

13. In a suction cleaner, a body, a rotatable brush,'a frame mounting said brush for vertical movement relative to said body, spring means urging said frame upwardly, a rotatable cam determining the upper position of said frame and movably mounted to force it downwardly against the force "exerted by said spring, relatively adjustable means to rotate'said cam in certain adjustments, bmsh-diameter-changeresponsive means controlling the relationship of said relatively adjustable means, and means responsive to rotational forces determining the position of said responsive means.

14. In a suction cleaner, a body, a rotatable brush, a frame mounting said brush for vertical movement relative to said body, spring means urging said frame upwardly, a rotatable cam determining the upper position of said frame and movably mounted to force it downwardly against the force exerted by said spring, means exerting a force to move said cam to force said frame downwardly, means preventing the movement of said cam, 'brush-diameter-change-responsive means controlling said last' mentioned means and adapted to adjust said last mentioned means to permit said cam to be moved upon registering a predetermined decrease in agitator diameter, and centrifugally operated means to move said responsive means to an inoperative position during the rotation of said brush.

15. In' a suction cleaner, a body, a rotatable brush, a frame mounting said'brush forvertical movement relative to said body, spring means urging said frame upwardly, a rotatable cam determining the upper position of said frame and the force exerted by said spring, relatively adiustable means to rotate said cam inscertain adjustments, brush diameter change -responsive means controlling the relationship of said relatively adjustable means, means W8 said responsive means into its diameter-change-determining position, a weight carried by saidbrush and movable radially under centrifugal force during the rotation thereof, and means actuated by the force exerted by said weight to move'said re- DOnsive' means from its diameter-change-determining position during the rotation of said brush.

16. In a suction cleaner, a body, a rotatable brush, a frame mountingsaid brush for vertical movably mounted to force it downwardly against movement relative to said body, spring means urging said frame upwardly, a rotatable cam determining the upper position of said frame and movably mounted to force it downwardly against the force exerted by said spring, relatively ad'- justable means to rotate said cam in certain adjustments, brush diameter change responsive nozzle, a rotatable brush, means mounting said brush in said nozzle for vertical movement, means in said nozzle to adjust automatically said brush vertically including brush-diameter-change-responsive means to determine the necessity of adjustment and centrifugally operated means to move said responsive means.

18. In a suction cleaner an agitator including.

an element subjected to wear fromnse, means to alter the position of said element to compensate for wear, and means responsive to wear in said element-tc actuate said last mentioned means and including motor-driven centrifugal means.

19. In a suction cleaner an agitator including a rotating agitating element subjected to wear in use resulting in dimensional change, means to alter the position of said element to compensate for such change, and means responsive to change in said element to actuate said last mentioned means and including motor-driven centrifugal means.

20. In a suction cleaner, an agitator including an element subjected to wear in the operation of the cleaner, means responsive tojchange in said element and means controlled by saidresponsive means and including motor-driven centrifugal means to effect step-by-step adjustment of said element to compensate for wear.

21. In a suction cleaner, an agitator including means operative at the end of cleaner operation to eifect adjustment of said element to compemsate forw WILLIAM D.

CERTIFICATE OF CORRECTION. I

Patent No.- 2,080, 510. may 18, 1957.

WILLIAM D. SELLERS.

. It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction follows: Page 5, second column, line '75, page 6, first column, line 1, claim 12, for crush diameter-responsive" read brush dimeter-change responsive; and that thesaid Letters Patent should be. read with this correction therein that the same may Conform to the record of the case in the Patent. Office.

Signed and sealed this 24th day of August, A. D. 1937.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

